PLEASE help me with hess's law! I dont understand it?

Lindsey

New member
Ammonia can be oxidized to nitric oxide in the following reaction.
4NH3(g) + 5O2(g) ---pt catalyst-->4NO(g) + 6H2O(g)

Find the enthalpy change for this oxidation process using the following three thermochemical equations.
N2(g) + O2(g)-->2NO(g) +180.8
N2(g) + 3H2(g) -->2NH3(g) -92.6
2H2(g) + O2(g) -->2H2O(g) -483.6

Thank you
 
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